US4552591A - Oil field biocide composition - Google Patents
Oil field biocide composition Download PDFInfo
- Publication number
- US4552591A US4552591A US06/610,452 US61045284A US4552591A US 4552591 A US4552591 A US 4552591A US 61045284 A US61045284 A US 61045284A US 4552591 A US4552591 A US 4552591A
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- Prior art keywords
- oil field
- isothiazolin
- biocide
- composition
- fluid
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Classifications
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- A—HUMAN NECESSITIES
- A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
- A01N—PRESERVATION OF BODIES OF HUMANS OR ANIMALS OR PLANTS OR PARTS THEREOF; BIOCIDES, e.g. AS DISINFECTANTS, AS PESTICIDES OR AS HERBICIDES; PEST REPELLANTS OR ATTRACTANTS; PLANT GROWTH REGULATORS
- A01N25/00—Biocides, pest repellants or attractants, or plant growth regulators, characterised by their forms, or by their non-active ingredients or by their methods of application, e.g. seed treatment or sequential application; Substances for reducing the noxious effect of the active ingredients to organisms other than pests
- A01N25/12—Powders or granules
-
- A—HUMAN NECESSITIES
- A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
- A01N—PRESERVATION OF BODIES OF HUMANS OR ANIMALS OR PLANTS OR PARTS THEREOF; BIOCIDES, e.g. AS DISINFECTANTS, AS PESTICIDES OR AS HERBICIDES; PEST REPELLANTS OR ATTRACTANTS; PLANT GROWTH REGULATORS
- A01N43/00—Biocides, pest repellants or attractants, or plant growth regulators containing heterocyclic compounds
- A01N43/72—Biocides, pest repellants or attractants, or plant growth regulators containing heterocyclic compounds having rings with nitrogen atoms and oxygen or sulfur atoms as ring hetero atoms
- A01N43/80—Biocides, pest repellants or attractants, or plant growth regulators containing heterocyclic compounds having rings with nitrogen atoms and oxygen or sulfur atoms as ring hetero atoms five-membered rings with one nitrogen atom and either one oxygen atom or one sulfur atom in positions 1,2
Definitions
- This invention relates to the field of oil well stimulation, drilling and recovery.
- the invention relates to biocides for oil field water treatment and as preservatives for polymers used in oil field fluids and, especially, to preservatives in solid form which inhibit the growth of bacteria in oil field waters and on polymers used in oil field well stimulation and drilling fluids.
- Polymers are used in the oil industry in methods of well stimulation, drilling and recovery.
- the polymers are subjected to an environment conducive to bacterial growth.
- the growth of the bacteria on polymers used in such fluids can materially alter the physical characteristics of the fluids.
- bacterial action can deteriorate the polymer, leading to loss of viscosity and subsequent ineffectiveness of the fluids.
- Fluids which are especially susceptible to bacterial degradation are those which contain polysaccharide and synthetic polymers.
- the term "oil field fluids" as used herein is meant to include those fluids having oil field applications and whose viscosity has been increased with polymers, whether polysaccharide and/or synthetic.
- the term "oil field waters” as used herein includes waters used in secondary recovery, and water used to hydrate the polymers and water used in tertiary or EOR (enhanced oil recovery) methods.
- biocides have been used in the past to treat oil field waters and oil field fluids used in oil field operations, they have been used, predominantly, in liquid form and, due to their very nature, must be handled with caution to avoid eye and skin contact from splashing. Also, the use of liquid biocides risks contamination of potable water sources from spilled biocides. Accordingly, there is a need for a safer form of biocides to avoid personal and environmental contamination.
- U.S. Pat. No. 3,699,231 discloses the use of an aldehyde/carbamate mixture to inhibit bacterial action.
- U.S. Pat. No. 3,929,561 discloses a biocide mixture of 5-chloro-2-methyl-4-isothiazole-e-one, 2-methyl-4-isothiazolin-e-one and a sulfone.
- U.S. Pat. Nos. 4,129,448 and 4,165,318 disclose mildew stabilization of acrylic emulsion polymr paints by using 3-isothiazolones as mildewcides and formaldehyde to stabilize the isothiazolones.
- U.S. Pat. No. 4,295,932 discloses a microbial inhibiting mixture of 5-chloro-2-methyl-4-isothiazolin-3-one, 2-methyl-4-isothiazolin-3-one and chlorine or chlorine dioxide.
- a biocidal composition which is comprised of a biocide and a granular solid adsorbent.
- the present invention provides methods for inhibiting microbial growth in oil field waters and for inhibiting microbial corrosion and starch and polymer degradation in oil field fluids comprising incorporating into said water and/or fluids an effective amount of antimicrobial composition of the invention.
- a biocidal composition comprising (1) at least one biocide and (2) a solid, particulate adsorbent therefor.
- biocide is useful in the compositions of the invention if the viscosity of the biocide is such that it will adhere to a solid adsorbent. There is no specific requirement for biocide viscosity since each biocide is unique in its effectiveness and ability to adhere to a solid adsorbent.
- Biocides which have been used in the past include aldehydes, e.g. formaldehyde, p-formaldehyde, glutaraldehyde, triazines, thiones, hydroxyalkylaminoalkanols, e.g. 2-hydroxymethyl-amino methanol, thiocarbamates, thiocyanates, isothiazolones and the like.
- aldehydes e.g. formaldehyde, p-formaldehyde, glutaraldehyde, triazines, thiones, hydroxyalkylaminoalkanols, e.g. 2-hydroxymethyl-amino methanol, thiocarbamates, thiocyanates, isothiazolones and the like.
- the isothiazolin-3-ones are the preferred biocides found useful in the compositions of the present invention.
- Suitable isothiazolin-3-ones useful in the composition of the invention include 2-methyl-4-isothiazolin-3-one, 2 ethyl-4-isothiazolin-3-one, 2-propyl-4-isothiazolin-3-one, 2-butyl-4-isothiazolin-3-one, 2-amyl-4-isothiazolin-3-one, 5-chloro-2-methyl-4-isothiazolin-3-one, 5-bromo-2-methyl-4-isothiazolin-3-one, 5-iodo-2-methyl-4-isothiazolin-3-one, 5-chloro-2-butyl-4-isothiazolin-3-one, 5-bromo-2-ethyl-4-isothiazolin-3-one, 5-iodo-2-amyl-4-isothiazolin-3-one and similar analogs and homologs within the genus.
- the present invention utilizes a mixture of isothiazolin-3-ones comprising isothiazolin-3-ones wherein the 2 position is substituted by an alkyl group having from about 1 to about 5 carbon atoms, especially from about 1 to about 3 carbon atoms, preferably 1 carbon atom and wherein the five position may be substituted by a halogen group, for example iodo, chloro and bromo, especially chloro.
- a halogen group for example iodo, chloro and bromo, especially chloro.
- the weight ratio of halogenated isothiazolin-3-one to non-halogenated isothiazolin-3-one is from about 94% to about 64%, preferably from about 73% to about 88%, especially about 79%.
- the adsorbents used in the compositions of the invention may be any of the well-known adsorbents having a high degree of surface area which are generally particulate, i.e. granular or bead-like in nature, and of sufficient integrity to avoid formation of a paste-like mass when contacted with the liquid biocide.
- common adsorbents which are useful include diatomaceous earth, silica, metal oxides such as alumina, bauxite, magnesia, iron oxides and the like, clays such as attapulgite, bone char, carbon, fuller's earth, zeolites, resins and waxes. Diatomaceous earth is preferred.
- the adsorbents should have a particle size of from about 9 micrometers to about 1200 micrometers. A useful average particle size is from about 150-700 micrometers.
- the biocide-adsorbent compositions of the invention may be prepared in a variety of ways.
- the biocide may be merely mixed with the adsorbent and used as such.
- the adsorbent may be saturated with the biocide and subjected to filtration followed by comminution of the filter cake.
- the adsorbent is added to a liquid/solid type blender which is vented and sealed. The blender is then activated and the biocide is gravity fed into the mixing chamber where a drip bar dispenses it over the adsorbent. The blender is allowed to run for 3-5 minutes or until all of the biocide has been thoroughly intermixed with the adsorbent. The blender is then shut down and the biocide-adsorbent composition is dispensed into an appropriate container.
- the amount of biocide added to the adsorbent will depend on the particular biocide being used and its effectiveness at various activity levels. Thus, the concentrated biocide is customarily diluted to afford an activity level commensurate with bacterial inhibition. Further, a solution of 10% by weight biocide in appropriate solvent (10% active) has biocidal properties which will vary depending on the particular biocide and the amount of the solution which is added to a particular bacterial substrate. Accordingly, a biocide may be added to the adsorbent undiluted (100% active) or it may be diluted with solvent to a very low active concentration, e.g. 0.01% active. With regard to the preferred isothiazolin-3-ones, the pure biocide is usually diluted with water or water/alcohol to achieve levels of from about 0.015% to about 25% active, preferably from about 1.5% to about 15% active.
- biocidal composition incorporated in a particular oil field water or oil field fluid polymer will vary widely as discussed above, depending upon the polymer itself, the particular inhibitor composition, the conditions of use of the water or polymer and the extent of prior contamination by bacteria, the time period of growth inhibition desired, general environment and the like. Thus, it is not possible to quantitatively delineate a minimum effective amount of the inhibiting composition. There is no maximum amount, although large excesses may not be desired from an economic standpoint.
- the resulting biocidal composition is incorporated into polymers used in oil field fluids including, for example, starches, carboxymethycellulose polymers, guar gums, polysaccharides, and polyacrylamides, in an effective bacterial inhibiting amount.
- the composition is incorporated in an amount of from about 10 ppm (parts per million) of active biocide to about 1000 ppm, preferably from about 500 ppm, based on the total parts of solution to be treated.
- 10 ppm of a 10% active biocide affords 1 ppm of active ingredient and 10 ppm of 100% active biocide affords 10 ppm of active ingredient.
- the biocidal preservative composition may be incorporated into the oil field water or oil field fluid polymer by adding the composition into the (1) water used for making the polymer solution, (2) concentrated polymer solution and/or (3) dilute polymer solution on a slug dose basis.
- the preservative compositions of the invention are effective against aerobic bacteria and anaerobic bacteria.
- the isothiazolin-3-ones are especially effective against sulfate reducing bacteria, for example "Desulfovibrio” species, e.g. "Desulfovibrio desulfurican” and "Desulfotomaculum” species, e.g. "Desulfotomaculum nigrificans”.
- Examples of aerobic bacteria and anaerobic bacteria which are commonly found in oil field fluids and oil field waters and which are inhibited by the compositions of the present invention include "Pseudomonad” species, e.g. "Pseudomonas fluorescens", "Bacillus” species, e.g. “Bacillus subtilis”, "Enterobacter” species, e.g. “Enterobacter aerogenes", "Serratia” species, e.g. "Serratia marcesens” and “Clostridia” species. Algae and fungi found in oil field waters and oil field fluids are also inhibited by the compositions of the invention.
- a bactericide performance test was set up in an oil field fluid containing a synthetic polyacrylamide polymer.
- the fluid was taken from a micellar polymer flood in which the polymer was used to increase viscosity.
- the fluid was made up of approximately 500 ppm of a high molecular weight partially hydrolyzed polyacrylamide polymer in filtered fresh water.
- the fluid was contaminated with approximately 12,000 aerobic bacteria per milliliter.
- An inhibitor composition consisting of a 50/50 mixture of 5-chloro-2-methyl-4-isothiazolin-3-one and 2-methyl-4-isothiazolin-3-one (1.5% active). The composition was added to the contaminated fluid. Samples were taken after 24 and 48 hour exposures and surviving aerobic bacteria were enumerated. The following results were obtained:
- the inhibitor mixture controlled bacterial growth at a concentration of between about 50 and about 200 ppm inhibitor.
- a bactericide performance test was set up in an oil field fluid containing an emulsion polyacrylamide polymer.
- the fluid was taken from a micellar polymer flood and was composed of approximately 3000 ppm of a 30% active partially hydrolyzed polyacrylamide emulsion polymer in fresh water.
- the fluid contained approximately 100,000 aerobic bacteria per milliliter and 1000 anaerobic sulfate reducing bacteria per milliliter.
- the bactericidal activity of an inhibitor mixture of the invention was compared to a control (no inhibitor). Samples were taken after three and seven days exposure and surviving aerobic and sulfate reducing bacteria enumerated. The following table presents the results of the test:
- the antimicrobial mixture effectively protected the polymer solution at a rate of between about 50 to about 150 ppm product.
- This example illustrates the comparative effectiveness of various concentrations of (a) a 50/50 liquid mixture of 5-chloro-2-methyl-4-isothiazolin-3-one and 2-methyl-4-isothiazolin-3-one (7% active) and (b) the same mixture of isothiazolin-3-ones adsorbed on Celite 545 (Johns-Manville) diatomaceous earth against typical fracturing fluid bacteria in a hydroxypropyl guar fracturing fluid (Jaguar HP-8, Stein-Hall Specialty Chemicals).
- the kill rate date are set forth in Table 3, below:
- the data illustrate that there is no difference in effectiveness when the liquid biocide is adsorbed on the diatomaceous earth.
- composition of the invention comprising a 7% active mixture of a 50/50 mixture of the isothiazolin-3-ones of Example 3 adsorbed on diatomaceous earth (Celite 545), at various concentrations as against typical field bacteria in hydroxypropyl guar fracturing fluids.
- the starting plate count was 540 colonies/ml.
- Table 4 The data are set forth in Table 4, below:
- the data illustrate that a 7% active concentration of the biocide on diatomaceous earth is effective at a concentration of 25 ppm or greater against field bacteria in a hydroxypropyl guar fracturing fluid.
- This example illustrates the effectiveness of the compositions of the invention against bacteria in drilling mud.
- composition of the invention is effective against bacteria in a drilling mud.
- This example illustrates the effectiveness of the composition of the invention against typical field bacteria in a salt water based drilling mud.
- compositions of the invention is as effective as the liquid isothiazolin-3-one and that other commercial liquid biocides are also effective and would be expected, on the basis of examples 1, 2 and 3, to be effective if used in conjunction with an adsorbent.
- the biocide composition of the invention presents no liquid handling problems and, thus, no personal or environmental problems associated with, for example, spilled or splashed liquid biocides.
- compositions of the invention find utility in the treatment of oil field water and oil field fluid polymers, e.g. polyacrylamides and polysaccharides, in the preservation of guar gum, hydroxypropyl guar gum and carboxymethylcellulose polymers used in fracturing fluids for oil well stimulation, and in the preservation of starches, guar gum, hydroxypropyl guar gum and carboxymethylcellulose polymers used in such fluids.
- oil field water and oil field fluid polymers e.g. polyacrylamides and polysaccharides
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- Life Sciences & Earth Sciences (AREA)
- Health & Medical Sciences (AREA)
- General Health & Medical Sciences (AREA)
- Dentistry (AREA)
- Plant Pathology (AREA)
- Engineering & Computer Science (AREA)
- Pest Control & Pesticides (AREA)
- Agronomy & Crop Science (AREA)
- Wood Science & Technology (AREA)
- Zoology (AREA)
- Environmental Sciences (AREA)
- Toxicology (AREA)
- Agricultural Chemicals And Associated Chemicals (AREA)
Abstract
Description
TABLE 1 ______________________________________ Concentra- Surviving bacteria/ml Compound tion (ppm) 24 Hours 48 Hours ______________________________________ 1.5% isothiazolin-3- 50 11,000 45,000 one mixture 75 2,500 53,000 100 8,100 52,000 200 1,500 1,800 Control (no inhibitor) 0 120,000 89,000 ______________________________________
TABLE 2 __________________________________________________________________________ Surviving Bacteria/ml 3 Days 7 Days Compound Concentration (ppm) Aerobes Reducers Aerobes Reducers __________________________________________________________________________ 1.5% Isothiazolin- 50 10,000 1-9 100,000 100 3-ones mixture 75 5,000 1-9 15,000 100 100 1,000 1-9 1,000 1-9 150 30 90-99 0 0 Control 0 14,000,000 1000 29,000,000 1000 __________________________________________________________________________
TABLE 3 ______________________________________ Concentra- Kill Rate (%) Compound tion (ppm) 24 Hrs. 72 Hrs. ______________________________________ Isothiazolin- 10 85 100 3-ones 25 85 100 (7% active) 150 95 100 200 99 100 Composition of 10 85 100 Invention 25 90 100 (7% active) 150 95 100 200 99 100 Control 0 0 0 ______________________________________
TABLE 4 ______________________________________ Concentra- Kill Rate (%) Compound tion (ppm) 24 Hrs. 48 Hrs. ______________________________________ Composition of 25 99.8 96.0 Invention 50 99.9 99.9 100 99.9 99.9 200 99.9 99.9 250 99.9 99.9 Control 0 0 0 ______________________________________
TABLE 5 ______________________________________ Concentra- % Kill Compound tion (ppm) Plate Density Method ______________________________________ Composition of 50 70 Invention 100 85 150 95 250 98 Control 0 0 ______________________________________
TABLE 6 ______________________________________ Concentra- % Kill (Days) Compound tions (ppm) 1 2 3 4 ______________________________________ Composition of 25 20 20 80 20 Invention (Ex. 3) 50 30 30 90 50 100 40 40 90 70 150 50 70 90 70 Liquid isothiaz- 100 20 40 80 20 olinones of Ex. 3 250 30 50 90 40 1.5% active) 500 40 60 90 50 1000 50 75 90 70 Glutaraldehyde 50 80 95 99.9 99.9 (50% active) 100 99 99.9 99.9 99.9 250 99.9 99.9 99.9 99.9 500 99.9 99.9 99.9 99.9 p-Formaldehyde 250 99 99.9 99.9 99.9 (100% active) 500 99.9 99.9 99.9 99.9 750 99.9 99.9 99.9 99.9 1000 99.9 99.9 99.9 99.9 Formaldehyde 100 50 90 99.9 99 (33% active) 250 75 98 99.9 99.9 500 90 99 99.9 99.9 1000 99.9 99.9 99.9 99.9 Methylene bis- 50 20 70 75 80 thiocyanate 100 20 75 85 95 (10% active) 250 30 80 90 95 500 45 90 90 95 Diothiocarbamate 250 50 80 90 80 (15% active) 500 75 85 95 85 750 80 95 99.9 90 1000 90 98 99.9 95 ______________________________________
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US06/610,452 US4552591A (en) | 1984-05-15 | 1984-05-15 | Oil field biocide composition |
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US06/610,452 US4552591A (en) | 1984-05-15 | 1984-05-15 | Oil field biocide composition |
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Cited By (51)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4780317A (en) * | 1986-01-28 | 1988-10-25 | Kurita Water Industries Ltd. | Sustained release antimicrobial agents and method of fouling control using the same |
EP0733304A2 (en) * | 1995-03-08 | 1996-09-25 | Kodak Limited | A material, method and apparatus for inhibiting bacterial growth in an aqueous medium |
US5648086A (en) * | 1990-12-10 | 1997-07-15 | Rohm And Haas Company | Stable solid form antimicrobial compositions comprising 3-isothiazolones |
EP0832561A2 (en) * | 1996-07-30 | 1998-04-01 | Eastman Kodak Company | A material, method and apparatus for inhibiting microbial growth in an aqueous medium |
US5866633A (en) * | 1995-03-08 | 1999-02-02 | Eastman Kodak Company | Material and method for inhibiting bacterial growth in an aqueous medium |
US5866151A (en) * | 1996-04-10 | 1999-02-02 | Southern Research Institute | Encapsulated biocidal preparation |
US6001158A (en) * | 1999-02-18 | 1999-12-14 | Baker Hughes Incorporated | Dry biocide |
US6482483B1 (en) * | 1997-10-04 | 2002-11-19 | Rhodia Consumer Specialties Limited | Phosphonium salt composition |
US20030092581A1 (en) * | 2001-11-13 | 2003-05-15 | Crews James B. | Fracturing fluids for delayed flow back operations |
US6818594B1 (en) | 1999-11-12 | 2004-11-16 | M-I L.L.C. | Method for the triggered release of polymer-degrading agents for oil field use |
US6905698B1 (en) | 1998-08-28 | 2005-06-14 | Ineos Silicas Limited | Particulate carrier for biocide formulations |
US20060065399A1 (en) * | 2004-09-29 | 2006-03-30 | Karen Luke | Zeolite compositions for lowering maximum cementing temperature |
US7048053B2 (en) | 2002-12-10 | 2006-05-23 | Halliburton Energy Services, Inc. | Zeolite compositions having enhanced compressive strength |
US20060124302A1 (en) * | 2004-12-15 | 2006-06-15 | Bj Services Company | Well treating compositions for slow release of treatment agents and methods of using the same |
US7140439B2 (en) | 2002-12-10 | 2006-11-28 | Halliburton Energy Services, Inc. | Zeolite-containing remedial compositions |
US7140440B2 (en) | 2002-12-10 | 2006-11-28 | Halliburton Energy Services, Inc. | Fluid loss additives for cement slurries |
US7147067B2 (en) | 2002-12-10 | 2006-12-12 | Halliburton Energy Services, Inc. | Zeolite-containing drilling fluids |
US7150321B2 (en) | 2002-12-10 | 2006-12-19 | Halliburton Energy Services, Inc. | Zeolite-containing settable spotting fluids |
US7182137B2 (en) | 2004-09-13 | 2007-02-27 | Halliburton Energy Services, Inc. | Cementitious compositions containing interground cement clinker and zeolite |
US7285166B2 (en) | 2002-12-10 | 2007-10-23 | Halliburton Energy Services, Inc. | Zeolite-containing cement composition |
US7297664B2 (en) | 2004-07-28 | 2007-11-20 | Halliburton Energy Services, Inc. | Cement-free zeolite and fly ash settable fluids and methods therefor |
US7296626B2 (en) | 2005-11-08 | 2007-11-20 | Halliburton Energy Services, Inc. | Liquid additive for reducing water-soluble chromate |
US20080029266A1 (en) * | 2006-08-02 | 2008-02-07 | Kemira Chemicals, Inc. | Biocide for well stimulation and treatment fluids |
US20080032903A1 (en) * | 2006-08-02 | 2008-02-07 | Ronald Joe Starkey | Biocide for well stimulation and treatment fluids |
US20080164219A1 (en) * | 2007-01-08 | 2008-07-10 | Halliburton Energy Services, Inc. | Hydraulic injection of biocide into tanks |
US7447072B2 (en) | 1991-11-26 | 2008-11-04 | Solid State Storage Solutions Llc | Storage device employing a flash memory |
US7448450B2 (en) | 2003-12-04 | 2008-11-11 | Halliburton Energy Services, Inc. | Drilling and cementing with fluids containing zeolite |
US7544640B2 (en) * | 2002-12-10 | 2009-06-09 | Halliburton Energy Services, Inc. | Zeolite-containing treating fluid |
US20100059226A1 (en) * | 2008-09-09 | 2010-03-11 | Tetra Technologies, Inc. | Method of Delivering Frac Fluid and Additives |
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US20100239679A1 (en) * | 2007-10-02 | 2010-09-23 | World Minerals, Inc. | Enhanced retention capabilities through methods comprising surface treatment of functional particulate carrier materials, and functional particulate carrier materials made therefrom |
US20110005969A1 (en) * | 2009-07-09 | 2011-01-13 | Giffin Wade J | Compositions and processes for fracturing subterranean formations |
US20120316259A1 (en) * | 2010-02-23 | 2012-12-13 | Clariant S.A. Brazil | Process For The Co-Encapsulation Of Biocidally Active Compounds In Clay Minerals Functionalized By Nitrogen Compounds |
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US9018142B2 (en) | 2008-12-18 | 2015-04-28 | Peroxychem Llc | Oil-field biocide method utilizing a peracid |
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US10400159B2 (en) | 2014-07-23 | 2019-09-03 | Baker Hughes, A Ge Company, Llc | Composite comprising well treatment agent and/or a tracer adhered onto a calcined substrate of a metal oxide coated core and a method of using the same |
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WO2021247810A1 (en) | 2020-06-04 | 2021-12-09 | Nutrition & Biosciences USA 4, Inc. | Dextran-alpha-glucan graft copolymers and derivatives thereof |
US11254850B2 (en) | 2017-11-03 | 2022-02-22 | Baker Hughes Holdings Llc | Treatment methods using aqueous fluids containing oil-soluble treatment agents |
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WO2023081346A1 (en) | 2021-11-05 | 2023-05-11 | Nutrition & Biosciences USA 4, Inc. | Glucan derivatives for microbial control |
WO2024112740A1 (en) | 2022-11-23 | 2024-05-30 | Nutrition & Biosciences USA 4, Inc. | Hygienic treatment of surfaces with compositions comprising hydrophobically modified alpha-glucan derivative |
Citations (13)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2504404A (en) * | 1946-06-12 | 1950-04-18 | Du Pont | Manganous ethylene bis-dithiocarbamate and fungicidal compositions containing same |
US3326748A (en) * | 1964-05-11 | 1967-06-20 | Pennsalt Chemicals Corp | Control of powdery mildew with zinc and antimony n, n-dibutyldithiocarbamates |
US3699231A (en) * | 1969-07-11 | 1972-10-17 | Dresser Ind | A method for inhibiting the growth of bacteria using a synergistic mixture of sodium dimethyldithiocarbamate and formaldehyde |
US3929561A (en) * | 1975-03-03 | 1975-12-30 | Betz Laboratories | Synergistic compositions containing bis (trichloromethyl) sulfone and their use |
US4093440A (en) * | 1974-07-15 | 1978-06-06 | Sogemaric | Solid phytosanitary composition |
US4107300A (en) * | 1973-09-28 | 1978-08-15 | Sankyo Company Limited | Stable solid agricultural chemical composition and process for preparation thereof |
US4122192A (en) * | 1976-04-26 | 1978-10-24 | Fellows Adrian | Disinfectant and sterilizing preparations |
US4129448A (en) * | 1973-08-20 | 1978-12-12 | Rohm And Haas Company | Formaldehyde stabilized coating compositions |
US4150026A (en) * | 1971-05-12 | 1979-04-17 | Rohm And Haas Company | Metal salt complexes of 3-isothiazolones |
US4165318A (en) * | 1977-09-06 | 1979-08-21 | Rohm And Haas Company | Formaldehyde stabilized coating compositions |
US4243403A (en) * | 1967-03-09 | 1981-01-06 | Rohm And Haas Company | 3-Isothiazolones |
US4295932A (en) * | 1980-07-14 | 1981-10-20 | Naloc Chemical Company | Synergistic blend of biocides |
US4332799A (en) * | 1976-08-12 | 1982-06-01 | Petrolite Corporation | Quaternaries of tertiary amino-substituted thiazines |
-
1984
- 1984-05-15 US US06/610,452 patent/US4552591A/en not_active Expired - Lifetime
Patent Citations (13)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2504404A (en) * | 1946-06-12 | 1950-04-18 | Du Pont | Manganous ethylene bis-dithiocarbamate and fungicidal compositions containing same |
US3326748A (en) * | 1964-05-11 | 1967-06-20 | Pennsalt Chemicals Corp | Control of powdery mildew with zinc and antimony n, n-dibutyldithiocarbamates |
US4243403A (en) * | 1967-03-09 | 1981-01-06 | Rohm And Haas Company | 3-Isothiazolones |
US3699231A (en) * | 1969-07-11 | 1972-10-17 | Dresser Ind | A method for inhibiting the growth of bacteria using a synergistic mixture of sodium dimethyldithiocarbamate and formaldehyde |
US4150026A (en) * | 1971-05-12 | 1979-04-17 | Rohm And Haas Company | Metal salt complexes of 3-isothiazolones |
US4129448A (en) * | 1973-08-20 | 1978-12-12 | Rohm And Haas Company | Formaldehyde stabilized coating compositions |
US4107300A (en) * | 1973-09-28 | 1978-08-15 | Sankyo Company Limited | Stable solid agricultural chemical composition and process for preparation thereof |
US4093440A (en) * | 1974-07-15 | 1978-06-06 | Sogemaric | Solid phytosanitary composition |
US3929561A (en) * | 1975-03-03 | 1975-12-30 | Betz Laboratories | Synergistic compositions containing bis (trichloromethyl) sulfone and their use |
US4122192A (en) * | 1976-04-26 | 1978-10-24 | Fellows Adrian | Disinfectant and sterilizing preparations |
US4332799A (en) * | 1976-08-12 | 1982-06-01 | Petrolite Corporation | Quaternaries of tertiary amino-substituted thiazines |
US4165318A (en) * | 1977-09-06 | 1979-08-21 | Rohm And Haas Company | Formaldehyde stabilized coating compositions |
US4295932A (en) * | 1980-07-14 | 1981-10-20 | Naloc Chemical Company | Synergistic blend of biocides |
Cited By (86)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4780317A (en) * | 1986-01-28 | 1988-10-25 | Kurita Water Industries Ltd. | Sustained release antimicrobial agents and method of fouling control using the same |
US5648086A (en) * | 1990-12-10 | 1997-07-15 | Rohm And Haas Company | Stable solid form antimicrobial compositions comprising 3-isothiazolones |
US5703105A (en) * | 1990-12-10 | 1997-12-30 | Rohm And Haas Company | Stable, solid form antimicrobial compositions comprising 3-isothiazolones |
US7447072B2 (en) | 1991-11-26 | 2008-11-04 | Solid State Storage Solutions Llc | Storage device employing a flash memory |
EP0733304A2 (en) * | 1995-03-08 | 1996-09-25 | Kodak Limited | A material, method and apparatus for inhibiting bacterial growth in an aqueous medium |
US5866633A (en) * | 1995-03-08 | 1999-02-02 | Eastman Kodak Company | Material and method for inhibiting bacterial growth in an aqueous medium |
US5932183A (en) * | 1995-03-08 | 1999-08-03 | Eastman Kodak Company | Material and method for inhibiting bacterial growth in an aqueous medium |
US5866151A (en) * | 1996-04-10 | 1999-02-02 | Southern Research Institute | Encapsulated biocidal preparation |
EP0832561A2 (en) * | 1996-07-30 | 1998-04-01 | Eastman Kodak Company | A material, method and apparatus for inhibiting microbial growth in an aqueous medium |
US5855899A (en) * | 1996-07-30 | 1999-01-05 | Eastman Kodak Company | Material method and apparatus for inhibiting microbial growth in an aqueous medium |
EP0832561A3 (en) * | 1996-07-30 | 1999-02-17 | Eastman Kodak Company | A material, method and apparatus for inhibiting microbial growth in an aqueous medium |
US6482483B1 (en) * | 1997-10-04 | 2002-11-19 | Rhodia Consumer Specialties Limited | Phosphonium salt composition |
US6905698B1 (en) | 1998-08-28 | 2005-06-14 | Ineos Silicas Limited | Particulate carrier for biocide formulations |
US6001158A (en) * | 1999-02-18 | 1999-12-14 | Baker Hughes Incorporated | Dry biocide |
US6818594B1 (en) | 1999-11-12 | 2004-11-16 | M-I L.L.C. | Method for the triggered release of polymer-degrading agents for oil field use |
US20030092581A1 (en) * | 2001-11-13 | 2003-05-15 | Crews James B. | Fracturing fluids for delayed flow back operations |
US7256160B2 (en) * | 2001-11-13 | 2007-08-14 | Baker Hughes Incorporated | Fracturing fluids for delayed flow back operations |
US7140439B2 (en) | 2002-12-10 | 2006-11-28 | Halliburton Energy Services, Inc. | Zeolite-containing remedial compositions |
US7544642B2 (en) | 2002-12-10 | 2009-06-09 | Halliburton Energy Services, Inc. | Zeolite-containing remedial compositions |
US7048053B2 (en) | 2002-12-10 | 2006-05-23 | Halliburton Energy Services, Inc. | Zeolite compositions having enhanced compressive strength |
US7140440B2 (en) | 2002-12-10 | 2006-11-28 | Halliburton Energy Services, Inc. | Fluid loss additives for cement slurries |
US7147067B2 (en) | 2002-12-10 | 2006-12-12 | Halliburton Energy Services, Inc. | Zeolite-containing drilling fluids |
US7150321B2 (en) | 2002-12-10 | 2006-12-19 | Halliburton Energy Services, Inc. | Zeolite-containing settable spotting fluids |
US7544640B2 (en) * | 2002-12-10 | 2009-06-09 | Halliburton Energy Services, Inc. | Zeolite-containing treating fluid |
US7338925B2 (en) | 2002-12-10 | 2008-03-04 | Halliburton Energy Services, Inc. | Zeolite compositions having enhanced compressive strength |
US7285166B2 (en) | 2002-12-10 | 2007-10-23 | Halliburton Energy Services, Inc. | Zeolite-containing cement composition |
US7285164B2 (en) | 2002-12-10 | 2007-10-23 | Halliburton Energy Services, Inc. | Fluid loss additives for cement slurries |
US7228905B2 (en) | 2002-12-10 | 2007-06-12 | Halliburton Energy Services, Inc. | Zeolite compositions having enhanced compressive strength |
US7448450B2 (en) | 2003-12-04 | 2008-11-11 | Halliburton Energy Services, Inc. | Drilling and cementing with fluids containing zeolite |
US7297664B2 (en) | 2004-07-28 | 2007-11-20 | Halliburton Energy Services, Inc. | Cement-free zeolite and fly ash settable fluids and methods therefor |
US7182137B2 (en) | 2004-09-13 | 2007-02-27 | Halliburton Energy Services, Inc. | Cementitious compositions containing interground cement clinker and zeolite |
US20070051279A1 (en) * | 2004-09-13 | 2007-03-08 | Fyten Glen C | Cementitious compositions containing interground cement clinker and zeolite |
US7303015B2 (en) | 2004-09-13 | 2007-12-04 | Halliburton Energy Services, Inc. | Cementitious compositions containing interground cement clinker and zeolite |
US7326291B2 (en) | 2004-09-13 | 2008-02-05 | Halliburton Energy Services, Inc. | Cementitious compositions containing interground cement clinker and zeolite |
US20070051280A1 (en) * | 2004-09-13 | 2007-03-08 | Fyten Glen C | Cementitious compositions containing interground cement clinker and zeolite |
US20070051515A1 (en) * | 2004-09-13 | 2007-03-08 | Fyten Glen C | Cementitious compositions containing interground cement clinker and zeolite |
US7332026B2 (en) | 2004-09-13 | 2008-02-19 | Halliburton Energy Services, Inc. | Cementitious compositions containing interground cement clinker and zeolite |
US7219733B2 (en) | 2004-09-29 | 2007-05-22 | Halliburton Energy Services, Inc. | Zeolite compositions for lowering maximum cementing temperature |
US20060065399A1 (en) * | 2004-09-29 | 2006-03-30 | Karen Luke | Zeolite compositions for lowering maximum cementing temperature |
US7493955B2 (en) | 2004-12-15 | 2009-02-24 | Bj Services Company | Well treating compositions for slow release of treatment agents and methods of using the same |
US7491682B2 (en) | 2004-12-15 | 2009-02-17 | Bj Services Company | Method of inhibiting or controlling formation of inorganic scales |
US20060124301A1 (en) * | 2004-12-15 | 2006-06-15 | Bj Services Company | Slow release scale inhibitor composites and methods of using the same |
US20060124302A1 (en) * | 2004-12-15 | 2006-06-15 | Bj Services Company | Well treating compositions for slow release of treatment agents and methods of using the same |
US7296626B2 (en) | 2005-11-08 | 2007-11-20 | Halliburton Energy Services, Inc. | Liquid additive for reducing water-soluble chromate |
US20080032903A1 (en) * | 2006-08-02 | 2008-02-07 | Ronald Joe Starkey | Biocide for well stimulation and treatment fluids |
US20080029266A1 (en) * | 2006-08-02 | 2008-02-07 | Kemira Chemicals, Inc. | Biocide for well stimulation and treatment fluids |
US7786054B2 (en) | 2006-08-02 | 2010-08-31 | Kemira Chemicals, Inc. | Biocide for well stimulation and treatment fluids |
US20100218950A1 (en) * | 2006-08-02 | 2010-09-02 | Kemira Chemicals, Inc. | Biocide for well stimulation and treatment fluids |
US7906463B2 (en) | 2006-08-02 | 2011-03-15 | Kemira Chemicals Inc. | Biocide for well stimulation and treatment fluids |
US20080164219A1 (en) * | 2007-01-08 | 2008-07-10 | Halliburton Energy Services, Inc. | Hydraulic injection of biocide into tanks |
US7562711B2 (en) * | 2007-01-08 | 2009-07-21 | Halliburton Energy Services, Inc. | Hydraulic injection of biocide into tanks |
US20100239679A1 (en) * | 2007-10-02 | 2010-09-23 | World Minerals, Inc. | Enhanced retention capabilities through methods comprising surface treatment of functional particulate carrier materials, and functional particulate carrier materials made therefrom |
US9943079B2 (en) | 2007-10-30 | 2018-04-17 | Imerys Filtration Minerals, Inc. | Modified mineral-based fillers |
DE112008002943T5 (en) | 2007-10-30 | 2010-09-09 | World Minerals Inc., Santa Barbara | Modified mineral-based fillers |
US20100260866A1 (en) * | 2007-10-30 | 2010-10-14 | World Minerals, Inc. | Modified mineral-based fillers |
US8162048B2 (en) | 2008-09-09 | 2012-04-24 | Tetra Technologies, Inc. | Method of delivering frac fluid and additives |
US8540022B1 (en) | 2008-09-09 | 2013-09-24 | Tetra Technologies, Inc. | Method of delivering frac fluid and additives |
US20100059226A1 (en) * | 2008-09-09 | 2010-03-11 | Tetra Technologies, Inc. | Method of Delivering Frac Fluid and Additives |
US9127537B1 (en) | 2008-09-09 | 2015-09-08 | Tetra Technologies, Inc. | Method of delivering frac fluid and additives |
US8316935B1 (en) | 2008-09-09 | 2012-11-27 | Tetra Technologies, Inc. | Method of delivering frac fluid and addivities |
US9018142B2 (en) | 2008-12-18 | 2015-04-28 | Peroxychem Llc | Oil-field biocide method utilizing a peracid |
WO2011005820A1 (en) | 2009-07-09 | 2011-01-13 | Titan Global Oil Services Inc. | Compositions and processes for fracturing subterranean formations |
US8293687B2 (en) | 2009-07-09 | 2012-10-23 | Titan Global Oil Services Inc. | Compositions and processes for fracturing subterranean formations |
US20110005969A1 (en) * | 2009-07-09 | 2011-01-13 | Giffin Wade J | Compositions and processes for fracturing subterranean formations |
US20120316259A1 (en) * | 2010-02-23 | 2012-12-13 | Clariant S.A. Brazil | Process For The Co-Encapsulation Of Biocidally Active Compounds In Clay Minerals Functionalized By Nitrogen Compounds |
US9228121B2 (en) * | 2010-02-23 | 2016-01-05 | Clariant S.A. | Process for the co-encapsulation of biocidally active compounds in clay minerals functionalized by nitrogen compounds |
US9010430B2 (en) | 2010-07-19 | 2015-04-21 | Baker Hughes Incorporated | Method of using shaped compressed pellets in treating a well |
US9976070B2 (en) | 2010-07-19 | 2018-05-22 | Baker Hughes, A Ge Company, Llc | Method of using shaped compressed pellets in well treatment operations |
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US8664168B2 (en) | 2011-03-30 | 2014-03-04 | Baker Hughes Incorporated | Method of using composites in the treatment of wells |
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